Commit Graph

38 Commits

Author SHA1 Message Date
netchild
9895b5ca9d - >500 static DTrace probes for the linuxulator
- DTrace scripts to check for errors, performance, ...
  they serve mostly as examples of what you can do with the static probe;s
  with moderate load the scripts may be overwhelmed, excessive lock-tracing
  may influence program behavior (see the last design decission)

Design decissions:
 - use "linuxulator" as the provider for the native bitsize; add the
   bitsize for the non-native emulation (e.g. "linuxuator32" on amd64)
 - Add probes only for locks which are acquired in one function and released
   in another function. Locks which are aquired and released in the same
   function should be easy to pair in the code, inter-function
   locking is more easy to verify in DTrace.
 - Probes for locks should be fired after locking and before releasing to
   prevent races (to provide data/function stability in DTrace, see the
   man-page of "dtrace -v ..." and the corresponding DTrace docs).
2012-05-05 19:42:38 +00:00
ed
28b4a002d6 Remove direct access to si_name.
Code should just use the devtoname() function to obtain the name of a
character device. Also add const keywords to pieces of code that need it
to build properly.

MFC after:	2 weeks
2012-02-10 12:35:57 +00:00
des
66f807ed8b Retire the MALLOC and FREE macros. They are an abomination unto style(9).
MFC after:	3 months
2008-10-23 15:53:51 +00:00
ed
ff609f1187 Push down the major/minor conversion for pts/%u to improve consistency.
In the mpsafetty branch, Linux sshd seems to work properly inside a
jail. Some small modifications had to be made to the Linux compatibility
layer.

The Linux PTY routines always expect the device major number to be 136
or higher. Our code always set the major/minor number pair to 136:0.
This makes routines like ttyname() and ptsname() fail, because we'll end
up having ambiguous device numbers.

The conversion was not performed on all *stat() routines, which meant in
some cases the numbers didn't get transformed. By pushing the conversion
into linux_driver_get_major_minor(), the transformation will take place
on all calls.

Approved by:	philip (mentor), rdivacky
2008-06-02 08:40:06 +00:00
kib
eb77b477b4 Implement the linux syscalls
openat, mkdirat, mknodat, fchownat, futimesat, fstatat, unlinkat,
    renameat, linkat, symlinkat, readlinkat, fchmodat, faccessat.

Submitted by:	rdivacky
Sponsored by:	Google Summer of Code 2007
Tested by:	pho
2008-04-08 09:45:49 +00:00
kib
eff8c6d35e Add the support for the AT_FDCWD and fd-relative name lookups to the
namei(9).

Based on the submission by rdivacky,
	sponsored by Google Summer of Code 2007
Reviewed by:	rwatson, rdivacky
Tested by:	pho
2008-03-31 12:01:21 +00:00
netchild
888f5e57b2 Partial MFp4 of 114977:
Whitespace commit: Fix grammar, spelling and punctuation.

Submitted by:	"Scot Hetzel" <swhetzel@gmail.com>
2007-02-24 16:49:25 +00:00
netchild
ec2ba5d85d Add the linux 2.6.x stuff (not used by default!):
- TLS - complete
 - pid/tid mangling - complete
 - thread area - complete
 - futexes - complete with issues
 - clone() extension - complete with some possible minor issues
 - mq*/timer*/clock* stuff - complete but untested and the mq* stuff is
   disabled when not build as part of the kernel with native FreeBSD mq*
   support (module support for this will come later)

Tested with:
 - linux-firefox - works, tested
 - linux-opera - works, tested
 - linux-realplay - doesnt work, issue with futexes
 - linux-skype - doesnt work, issue with futexes
 - linux-rt2-demo - works, tested
 - linux-acroread - doesnt work, unknown reason (coredump) and sometimes
   issue with futexes
 - various unix utilities in linux-base-gentoo3 and linux-base-fc4:
   everything tried worked

On amd64 not everything is supported like on i386, the catchup is planned for
later when the remaining bugs in the new functions are fixed.

To test this new stuff, you have to run
	sysctl compat.linux.osrelease=2.6.16
to switch back use
	sysctl compat.linux.osrelease=2.4.2

Don't switch while running a linux program, strange things may or may not
happen.

Sponsored by:			Google SoC 2006
Submitted by:			rdivacky
Some suggestions/help by:	jhb, kib, manu@NetBSD.org, netchild
2006-08-15 12:54:30 +00:00
ambrisko
31b22ce017 Enhance the Linux emulation layer to make MegaRAID SAS managements tool happy.
Add back in a scheme to emulate old type major/minor numbers via hooks into
stat, linprocfs to return major/minors that Linux app's expect.  Currently
only /dev/null is always registered.  Drivers can register via the Linux
type shim similar to the ioctl shim but by using
linux_device_register_handler/linux_device_unregister_handler functions.
The structure is:

    struct linux_device_handler {
        char    *bsd_driver_name;
        char    *linux_driver_name;
        char    *bsd_device_name;
        char    *linux_device_name;
        int     linux_major;
        int     linux_minor;
        int     linux_char_device;
    };

Linprocfs uses this to display the major number of the driver.  The
soon to be available linsysfs will use it to fill in the driver name.
Linux_stat uses it to translate the major/minor into Linux type values.

Note major numbers are dynamically assigned via passing in a -1 for
the major number so we don't need to keep track of them.

This is somewhat needed due to us switching to our devfs.  MegaCli
will not run until I add in the linsysfs and mfi Linux compat changes.

Sponsored by:	IronPort Systems
2006-05-05 16:10:45 +00:00
jhb
407a285a6f Remove linux_emul_find() and the CHECKALT*() macros as they are no longer
used.
2005-03-01 17:57:45 +00:00
jhb
6fab308776 Make linux_emul_convpath() a simple wrapper for kern_alternate_path(). 2005-02-07 18:46:05 +00:00
imp
362fcfc1e2 Start each of the license/copyright comments with /*- 2005-01-05 22:34:37 +00:00
bde
4a8d4eb719 Include <sys/mutex.h> and its prerequisite <sys/lock.h> instead of
depending on namespace pollution in <sys/vnode.h> for the definition
of GIANT_REQUIRED.

Sorted includes.
2004-06-23 06:35:43 +00:00
rwatson
6286ff7bea Mark linux_emul_convpath() as GIANT_REQUIRED. 2004-06-22 04:22:34 +00:00
truckman
f76d668175 VOP_GETATTR() wants the vnode passed to it to be locked. Instead
of adding the code to lock and unlock the vnodes and taking care
to avoid deadlock, simplify linux_emul_convpath() by comparing the
vnode pointers directly instead of comparing their va_fsid and
va_fileid attributes.  This allows the removal of the calls to
VOP_GETATTR().
2004-01-14 22:38:03 +00:00
obrien
f72cbcf207 Use __FBSDID(). 2003-06-10 21:29:12 +00:00
imp
cf874b345d Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
alfred
bf8e8a6e8f Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
alfred
6f979f7e5f Add function linux_msg() for regulating output from the linux emulation
code, make the emulator use it.

Rename unsupported_msg() to unimplemented_syscall().  Rename some arguments
for clarity

Fixup grammar.

Requested by: bde
2003-01-02 02:19:10 +00:00
iedowse
285c5385d5 Add a new function linux_emul_convpath(), which is a version of
linux_emul_find() that does not use stack gap storage but instead
always returns the resulting path in a malloc'd kernel buffer.
Implement linux_emul_find() in terms of this function. Also add
LCONVPATH* macros that wrap linux_emul_convpath in the same way
that the CHECKALT* macros wrap linux_emul_find().
2002-09-01 21:15:37 +00:00
jhb
3706cd3509 Simple p_ucred -> td_ucred changes to start using the per-thread ucred
reference.
2002-02-27 18:32:23 +00:00
des
f5a4c275f5 Eliminate the prefix parameter to linux_emul_find(), which was always
linux_emul_path anyway.  Linux_emul_find() has interesting bugs in its
prefix handling (which luckily are not currently exploitable); this
commit is preliminary to an attempt at cleaning it up.

Approved by:	marcel
2001-10-27 11:15:19 +00:00
julian
5596676e6c KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
asmodai
2f1d3e2cdf Fix typo: seperate -> separate.
Seperate does not exist in the english language.
2001-02-06 11:21:58 +00:00
jhb
b6baa60b1e Back out proc locking to protect p_ucred for obtaining additional
references along with the actual obtaining of additional references.
2001-01-27 00:01:31 +00:00
jhb
81c40ecc9c Lock access to proc members.
Glanced over by:	marcel
2000-12-15 19:41:27 +00:00
marcel
219e29595a Update include directives. 2000-08-22 01:51:54 +00:00
marcel
a069944f46 Add bounds checking to stackgap_alloc. Previously it was possible
to construct a path that was long enough (ie longer than
SPARE_USRSPACE bytes) and trash the stack.

Note that SPARE_USRSPACE is much smaller than MAXPATHLEN so that
the Linuxulator will now return ENAMETOOLONG even if the path
is smaller than MAXPATHLEN.

PR: 12749
2000-07-23 16:54:18 +00:00
phk
10914aa708 Remove unneeded #include <vm/vm_zone.h>
Generated by:	src/tools/tools/kerninclude
2000-04-30 18:52:11 +00:00
eivind
87724eb673 Introduce NDFREE (and remove VOP_ABORTOP) 1999-12-15 23:02:35 +00:00
peter
3b842d34e8 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
bde
98c28d00a7 Removed unused #includes. 1997-07-20 16:06:08 +00:00
bde
117209856b Don't include <sys/ioctl.h> in the kernel. Stage 1: don't include
it when it is not used.  In most cases, the reasons for including it
went away when the special ioctl headers became self-sufficient.
1997-03-24 11:25:10 +00:00
peter
94b6d72794 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
jkh
808a36ef65 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
bde
9abb9299ce Changed type of ni_dirp in struct namei' from caddr_t to const char *'
so that the compiler can see that it is OK to use const strings in
NDINIT().  Some emulators want to use paths of the form "/compat/foo".
Removed the casts that hid the non-problem.  Didn't fix the missing
consts in syscalls.master that hid the non-problem.
1996-09-03 23:17:15 +00:00
nate
0eba1141e3 Fix memory leak bug in the path parsing code which never released it's
buffer in certain error conditions.  Sync up the code to that in NetBSD
where applicable.

Reviewed by:	Gary Jennejohn <garyj@munich.netsurf.de>
Submitted by:	Michael Smith <msmith@atrad.adelaide.edu.au>
Obtained from:	NetBSD sources
1996-08-05 20:52:30 +00:00
peter
8465726bda Mega-commit for Linux emulator update.. This has been stress tested under
netscape-2.0 for Linux running all the Java stuff.  The scrollbars are now
working, at least on my machine. (whew! :-)

I'm uncomfortable with the size of this commit, but it's too
inter-dependant to easily seperate out.

The main changes:

COMPAT_LINUX is *GONE*.  Most of the code has been moved out of the i386
machine dependent section into the linux emulator itself.  The int 0x80
syscall code was almost identical to the lcall 7,0 code and a minor tweak
allows them to both be used with the same C code.  All kernels can now
just modload the lkm and it'll DTRT without having to rebuild the kernel
first.  Like IBCS2, you can statically compile it in with "options LINUX".

A pile of new syscalls implemented, including getdents(), llseek(),
readv(), writev(), msync(), personality().  The Linux-ELF libraries want
to use some of these.

linux_select() now obeys Linux semantics, ie: returns the time remaining
of the timeout value rather than leaving it the original value.

Quite a few bugs removed, including incorrect arguments being used in
syscalls..  eg:  mixups between passing the sigset as an int, vs passing
it as a pointer and doing a copyin(), missing return values, unhandled
cases, SIOC* ioctls, etc.

The build for the code has changed.  i386/conf/files now knows how
to build linux_genassym and generate linux_assym.h on the fly.

Supporting changes elsewhere in the kernel:

The user-mode signal trampoline has moved from the U area to immediately
below the top of the stack (below PS_STRINGS).  This allows the different
binary emulations to have their own signal trampoline code (which gets rid
of the hardwired syscall 103 (sigreturn on BSD, syslog on Linux)) and so
that the emulator can provide the exact "struct sigcontext *" argument to
the program's signal handlers.

The sigstack's "ss_flags" now uses SS_DISABLE and SS_ONSTACK flags, which
have the same values as the re-used SA_DISABLE and SA_ONSTACK which are
intended for sigaction only.  This enables the support of a SA_RESETHAND
flag to sigaction to implement the gross SYSV and Linux SA_ONESHOT signal
semantics where the signal handler is reset when it's triggered.

makesyscalls.sh no longer appends the struct sysentvec on the end of the
generated init_sysent.c code.  It's a lot saner to have it in a seperate
file rather than trying to update the structure inside the awk script. :-)

At exec time, the dozen bytes or so of signal trampoline code are copied
to the top of the user's stack, rather than obtaining the trampoline code
the old way by getting a clone of the parent's user area.  This allows
Linux and native binaries to freely exec each other without getting
trampolines mixed up.
1996-03-02 19:38:20 +00:00